Improve toast notifications and document clearing flow

- Enhanced Toaster component with theme, close button and rich colors
    - Added immediate feedback for document clearing operation

lightrag_webui/src/AppRouter.tsx

@@ -80,7 +80,12 @@ const AppRouter = () => {
     <ThemeProvider>
       <Router>
         <AppContent />
-        <Toaster position="bottom-center" />
+        <Toaster
+          position="bottom-center"
+          theme="system"
+          closeButton
+          richColors
+        />
       </Router>
     </ThemeProvider>
   )

lightrag_webui/src/components/documents/ClearDocumentsDialog.tsx

@@ -61,6 +61,14 @@ export default function ClearDocumentsDialog({ onDocumentsCleared }: ClearDocume
     try {
       const result = await clearDocuments()
 
+      if (result.status !== 'success') {
+        toast.error(t('documentPanel.clearDocuments.failed', { message: result.message }))
+        setConfirmText('')
+        return
+      }
+
+      toast.success(t('documentPanel.clearDocuments.success'))
+
       if (clearCacheOption) {
         try {
           await clearCache()
@@ -70,28 +78,19 @@ export default function ClearDocumentsDialog({ onDocumentsCleared }: ClearDocume
         }
       }
 
-      if (result.status === 'success') {
-        toast.success(t('documentPanel.clearDocuments.success'))
-      } else {
-        toast.error(t('documentPanel.clearDocuments.failed', { message: result.message }))
-      }
-    } catch (err) {
-      toast.error(t('documentPanel.clearDocuments.error', { error: errorMessage(err) }))
-    } finally {
-      // Execute these operations regardless of success or failure
-      try {
-        // Update backend state
+      // Update health check status
       await check()
 
-        // Refresh document list
+      // Refresh document list if provided
       if (onDocumentsCleared) {
         await onDocumentsCleared()
       }
-      } catch (refreshErr) {
-        console.error('Error refreshing state:', refreshErr)
-      }
 
+      // 所有操作成功后关闭对话框
       setOpen(false)
+    } catch (err) {
+      toast.error(t('documentPanel.clearDocuments.error', { error: errorMessage(err) }))
+      setConfirmText('')
     }
   }, [isConfirmEnabled, clearCacheOption, setOpen, t, check, onDocumentsCleared])